It is illegal to reuse stamps – though that doesn’t stop people doing it. Some post offices are now cancelling stamps using UV ink – which the eye can’t see, but the machines can detect. Some stamps are also made with little cuts in them to make it harder to peel them off.Click to see full answer. Also question is, can the post office tell if you reuse a stamp?No, Postal Requlations do not allow the reuse of postage stamps – Even if they are not cancelled. Also note that they may be cancelled by tagging which you can’t see with your naked eye that easily if at all. Granted many people soak them off and glue them on a new envelope if not cancelled.Likewise, can you reuse unstamped stamps? No, unfranked stamps do not have a secret mark. You can reuse them and no one will ever know, provided you do it neatly enough. Similarly one may ask, how do you remove and reuse a stamp? How to Remove Used Stamps from an Envelope Don’t peel THEM! Cut or tear the envelope around the stamps. Float the stamps face up in cool water. Soak for one hour or until the stamps separate from the paper. Lay the stamps face down on white paper towels. Cover with more paper and press flat under something heavy (like books) for several hours until dry. Can you use the same stamp twice?No, a used stamp cannot be reused. If the stamp was already used to send mail through the USPS®, it cannot be used to mail a different mailpiece even if the stamp was not canceled, or defaced by the Postal Service™ to make a stamp unusable.

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